#
# data = range(1,420000000)
#
# count = 0
# def er_fen (serch,date_list,count):
#     mid = int(len(date_list)/2)
#     if mid > 0:
#         if date_list[mid] == serch :
#             print("已找到:",serch,count)
#         elif date_list[mid] > serch :
#             print(date_list[mid],date_list[:mid],count)
#             er_fen(serch,date_list[:mid],count+1)
#         else:
#             print(date_list[mid],date_list[mid+1:],count)
#             er_fen(serch,date_list[mid+1:],count+1)
#     else:
#         print(serch,"此数不存在")
#
#
# er_fen(1,data,count)
#
#



def a(b):
    '''

    :param b:
    :return:
    '''''
